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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef DOM_SVG_SVGUSEELEMENT_H_
#define DOM_SVG_SVGUSEELEMENT_H_
#include "mozilla/dom/FromParser.h"
#include "mozilla/dom/IDTracker.h"
#include "mozilla/dom/SVGGraphicsElement.h"
#include "mozilla/RefPtr.h"
#include "nsCOMPtr.h"
#include "nsStubMutationObserver.h"
#include "SVGAnimatedLength.h"
#include "SVGAnimatedString.h"
#include "nsTArray.h"
class nsIContent;
nsresult NS_NewSVGSVGElement(
nsIContent** aResult, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
mozilla::dom::FromParser aFromParser);
nsresult NS_NewSVGUseElement(
nsIContent** aResult, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
namespace mozilla {
class Encoding;
class SVGUseFrame;
struct URLExtraData;
namespace dom {
using SVGUseElementBase = SVGGraphicsElement;
class SVGUseElement final : public SVGUseElementBase,
public nsStubMutationObserver {
friend class mozilla::SVGUseFrame;
protected:
friend nsresult(::NS_NewSVGUseElement(
nsIContent** aResult,
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo));
explicit SVGUseElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
virtual ~SVGUseElement();
JSObject* WrapNode(JSContext* cx, JS::Handle<JSObject*> aGivenProto) override;
public:
NS_IMPL_FROMNODE_WITH_TAG(SVGUseElement, kNameSpaceID_SVG, use)
nsresult BindToTree(BindContext&, nsINode& aParent) override;
void UnbindFromTree(UnbindContext&) override;
// interfaces:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SVGUseElement, SVGUseElementBase)
NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
// SVGElement specializations:
gfxMatrix PrependLocalTransformsTo(
const gfxMatrix& aMatrix,
SVGTransformTypes aWhich = eAllTransforms) const override;
bool HasValidDimensions() const override;
// nsIContent interface
nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;
NS_IMETHOD_(bool) IsAttributeMapped(const nsAtom* aAttribute) const override;
static nsCSSPropertyID GetCSSPropertyIdForAttrEnum(uint8_t aAttrEnum);
// WebIDL
already_AddRefed<DOMSVGAnimatedString> Href();
already_AddRefed<DOMSVGAnimatedLength> X();
already_AddRefed<DOMSVGAnimatedLength> Y();
already_AddRefed<DOMSVGAnimatedLength> Width();
already_AddRefed<DOMSVGAnimatedLength> Height();
nsIURI* GetSourceDocURI();
const Encoding* GetSourceDocCharacterSet();
URLExtraData* GetContentURLData() const { return mContentURLData; }
// Updates the internal shadow tree to be an up-to-date clone of the
// referenced element.
void UpdateShadowTree();
// Shared code between AfterSetAttr and SVGUseFrame::AttributeChanged.
//
// This is needed because SMIL doesn't go through AfterSetAttr unfortunately.
void ProcessAttributeChange(int32_t aNamespaceID, nsAtom* aAttribute);
void AfterSetAttr(int32_t aNamespaceID, nsAtom* aAttribute,
const nsAttrValue* aValue, const nsAttrValue* aOldValue,
nsIPrincipal* aSubjectPrincipal, bool aNotify) final;
protected:
// Information from walking our ancestors and a given target.
enum class ScanResult {
// Nothing that should stop us from rendering the shadow tree.
Ok,
// We're never going to be displayed, so no point in updating the shadow
// tree.
//
// However if we're referenced from another tree that tree may need to be
// rendered.
Invisible,
// We're a cyclic reference to either an ancestor or another shadow tree. We
// shouldn't render this <use> element.
CyclicReference,
// We're too deep in our clone chain, we shouldn't be rendered.
TooDeep,
};
ScanResult ScanAncestors(const Element& aTarget) const;
ScanResult ScanAncestorsInternal(const Element& aTarget,
uint32_t& aCount) const;
/**
* Helper that provides a reference to the element with the ID that is
* referenced by the 'use' element's 'href' attribute, and that will update
* the 'use' element if the element that that ID identifies changes to a
* different element (or none).
*/
class ElementTracker final : public IDTracker {
public:
explicit ElementTracker(SVGUseElement* aOwningUseElement)
: mOwningUseElement(aOwningUseElement) {}
private:
void ElementChanged(Element* aFrom, Element* aTo) override {
IDTracker::ElementChanged(aFrom, aTo);
if (aFrom) {
aFrom->RemoveMutationObserver(mOwningUseElement);
}
mOwningUseElement->TriggerReclone();
}
SVGUseElement* mOwningUseElement;
};
SVGUseFrame* GetFrame() const;
LengthAttributesInfo GetLengthInfo() override;
StringAttributesInfo GetStringInfo() override;
/**
* Returns true if our width and height should be used, or false if they
* should be ignored. As per the spec, this depends on the type of the
* element that we're referencing.
*/
bool OurWidthAndHeightAreUsed() const;
void SyncWidthOrHeight(nsAtom* aName);
void LookupHref();
void TriggerReclone();
void UnlinkSource();
enum { ATTR_X, ATTR_Y, ATTR_WIDTH, ATTR_HEIGHT };
SVGAnimatedLength mLengthAttributes[4];
static LengthInfo sLengthInfo[4];
enum { HREF, XLINK_HREF };
SVGAnimatedString mStringAttributes[2];
static StringInfo sStringInfo[2];
RefPtr<SVGUseElement> mOriginal; // if we've been cloned, our "real" copy
ElementTracker mReferencedElementTracker;
RefPtr<URLExtraData> mContentURLData; // URL data for its anonymous content
};
} // namespace dom
} // namespace mozilla
#endif // DOM_SVG_SVGUSEELEMENT_H_
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